Most external doors will be made of wood, often incorporating a glass pane. Though not up to modern standards the heat lost through the fabric of the door will not be substantial and would certainly not justify replacement of the door. Old doors can, however, be very draughty. Again the first solution will be to repair the door, the frame and any threshold. Draught-proofing can often be added more easily to doors than to windows. Heavy curtains are particularly effective for doors, as are humble sausage shaped draught excluders!
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